Struct ProblemJson 

pub struct ProblemJson<T>(pub T);

The problem-flavored sibling of ApiJson: deserializes a JSON request body exactly like axum::Json, but extraction failures reject with an RFC 9457 Problem body via ProblemRejection.

Status codes and the stable code extension member match ApiJson’s rejections exactly:

• malformed JSON -> 400 Bad Request, code INVALID_JSON
• well-formed JSON of the wrong shape -> 422 Unprocessable Entity, code INVALID_BODY
• missing or incorrect Content-Type -> 415 Unsupported Media Type, code UNSUPPORTED_MEDIA_TYPE

The problem body carries the same information the flat rejection would: detail is the same human-readable message, the stable code becomes the "code" extension member, and title comes from the status’s canonical reason. The Content-Type is negotiated from the request’s Accept headers via ProblemFormat::negotiate. It also implements IntoResponse (serializing as 200 OK plain JSON), so it can be used as a handler return type just like ApiJson.

Requires the problem and extract features.

Example

use axum_api_kit::ProblemJson;
use serde::Deserialize;

#[derive(Deserialize)]
struct CreateUser {
    name: String,
}

// Bad input short-circuits with an RFC 9457 problem details body.
async fn create_user(ProblemJson(user): ProblemJson<CreateUser>) {
    let _ = user.name;
}

Tuple Fields

0: T

Trait Implementations

impl<T: Clone> Clone for ProblemJson<T>

fn clone(&self) -> ProblemJson<T>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T: Debug> Debug for ProblemJson<T>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<T, S> FromRequest<S> for ProblemJson<T>

where T: DeserializeOwned, S: Send + Sync,

Available on crate feature extract only.

type Rejection = ProblemRejection

If the extractor fails it’ll use this “rejection” type. A rejection is a kind of error that can be converted into a response.

async fn from_request(req: Request, state: &S) -> Result<Self, Self::Rejection>

Perform the extraction.

impl<T: Serialize> IntoResponse for ProblemJson<T>

Available on crate feature extract only.

fn into_response(self) -> Response

Create a response.